Background characters?

[kate-fire.livejournal.com]

This is a pretty broad spectrum search so I hope you guys can help!

I'm looking for fic that mentions how background characters have multiple degrees or dimensions.  For example, the SGC is supposed to be the best of the best, right?  So some of the marines must have skills past the normal marine skills, and I think that the Atlantis team would have used them, especially the first year when they were cut off.   The fics don't have to be background-character-centric, but a mention of them would be great.  Any pairing, any genre welcome. 

In short:

~Marines with science skills
~Scientists with cross-discipline skills
~ don't have to be main characters, even a paragraph about them will do.


Thanks!